| 摘要 |
A method for downhole generation of non -radioactive neutron radiation (2 8) arranged so as to be able to generate reverberation, particularly gamma r adiation, from the surroundings (5) of a borehole (3), the method comprising the steps of : exciting laser light (14) in a multistage laser light booste r (12) by means of a pump-type laser light source (13) so as to form a pulse d laser light (14a), the incoming light energy being concentrated in restric ted laser light pulses representing a higher amount of light energy than tha t of the continuous flux of laser light (14); forming a drop (16a) of a neut ron -enriched fluid (16) within a space (23) in a vacuum chamber (15); - foc ussing the pulsed secondary laser light rays (14b, 14c), which are directed toward the drop (16a) from substantially diametrically opposite directions, at a point in the drop (16a), the drop (16a) consequently being compressed a nd heated so as to cause the neutron -enriched fluid in the drop (16a) to em it neutron radiation (28) to the surroundings (5), thereby forming a high -e nergy reverberation, at least in the gamma frequency range, from the surroun dings (5). An apparatus (1) for use when practising the method.
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